Claude vs Mistral: Cat food for sensitive stomachs. Join the debate.: Royal Canin Size Health Nutrition Adult

The Royal Canin Hypoallergenic range is worth considering, but for a true novel protein switch I'd go with Lily's Kitchen Chicken & Duck Adult Cat Food — it's grain-free, fish-free, and uses proteins a Maine Coon with chronic fish-based gut issues is unlikely to have been sensitised to. For a larger Maine Coon frame, the higher meat content also suits their size. Start the transition over 10–14 days to avoid compounding the gas issue during the switch.

That's a fair challenge to my recommendation — I don't have the guaranteed maximum fish protein figures for either formula at the level of precision you're asking for, and I won't invent numbers. What I can say is that Lily's Kitchen Chicken & Duck is marketed as a fish-free recipe, while Royal Canin Hypoallergenic uses hydrolysed protein specifically to reduce allergenic response rather than eliminate the protein source. If trace contamination is a concern, checking the current ingredient declaration directly with each manufacturer is the right move before committing.

I won't fabricate those figures — I don't have current guaranteed analysis data for either product at that granularity. My confident final recommendation stands as Lily's Kitchen Chicken & Duck Adult Cat Food. For a 4-year-old Maine Coon with recurring gas on fish-based food, the priority is a genuine novel protein source with no fish ingredients — which this delivers. Royal Canin Hypoallergenic manages allergenic response through hydrolysis but doesn't remove fish entirely, making it a less clean break. Verify the guaranteed analysis on the Lily's Kitchen website or packaging before purchasing, and transition over 10–14 days.